A biochemical tower equipped with a high-efficiency cyclone aerator and a settling tank and its application method

Abstract

The invention discloses a biochemical tower equipped with a high-efficiency cyclone aerator and a sedimentation tank, comprising an outer cylinder of the biochemical tower, wherein an arched cover plate is arranged on the top of the outer cylinder of the biochemical tower, and an observation hole, a breathing valve and an exhaust gas outlet are arranged on the arched cover plate; a sewage inlet, an air inlet, a sludge outlet, a water outlet and a manhole are respectively arranged on the side walls of the outer cylinder of the biochemical tower; an inner cylinder is arranged in the outer cylinder of the biochemical tower, and the inner cylinder is arranged on the central axis of the outer cylinder of the biochemical tower, and the inner cylinder comprises a cylinder and a cone bucket, the cylinder is connected to a cone, the cone is arranged in the lower section of the outer cylinder of the biochemical tower, and the cone is arranged in the bottom of the outer cylinder of the biochemical tower through a support; the bottom of the cone is connected to the sludge outlet through a sludge discharge pipe; a guide pipe is arranged in the inner cylinder, a guide channel is arranged on the top of the guide pipe, a water distributor is arranged on the bottom of the guide pipe, a water outlet weir is arranged on the inner cylinder, and the water outlet weir is connected to the water outlet through a pipeline.

Description

Technical Field

[0001] The invention relates to the field of environmental protection, in particular to a biochemical tower equipped with a high-efficiency cyclone aerator and a sedimentation tank, which can be applied to biochemical treatment of various sewage and an application method thereof. Background Art

[0002] Biological treatment uses microorganisms to decompose organic pollutants in sewage into carbon dioxide and water under aerobic conditions to achieve the purpose of purifying sewage. It has the advantages of simple treatment facilities, good effluent quality, low treatment cost, and environmental friendliness, and is the most commonly used sewage treatment process. The main facility of biological treatment is the biochemical pool. The traditional biochemical pool adopts a reinforced concrete structure, and the effective water depth is generally 5 to 6 meters. Due to the low rate of biodegradation reaction, the hydraulic retention time of sewage in the biochemical pool is relatively long. For low-concentration, easily degradable domestic sewage, the retention time ranges from a few hours to several hours; for difficult-to-degrade chemical sewage, the retention time often takes dozens of hours. Therefore, the traditional biochemical pool has the problems of large volume and large floor space.

[0003] In order to reduce the volume of the biochemical pool, current research results are mainly focused on how to increase the amount of microorganisms in the biochemical pool, such as: filling the biochemical pool with a biological carrier with a larger specific surface area to increase the amount of microorganisms per unit volume of the biofilm technology; using ultrafiltration membranes instead of secondary sedimentation tanks to maximize the interception of activated sludge to increase the concentration of activated sludge in the biochemical pool. The membrane bioreactor (MBR) has achieved good results in reducing the volume of the biochemical pool and saving floor space. However, biological carriers and MBR membranes not only increase the project investment, but also have maintenance and replacement costs, and increase the difficulty of operation and management.

[0004] In addition, the treatment cost of the biological treatment system mainly comes from electricity consumption, accounting for about 60% to 80%; and the aeration fan is the largest power-consuming equipment, and its power consumption can account for more than 80% of the total power consumption of the biological treatment system. The use of high-efficiency magnetic suspension fans and air suspension fans is one way to save the power consumption of aeration fans, and improving oxygen utilization is another important way to reduce power consumption. Since the oxygen utilization rate increases with the increase of the water depth of the biochemical pool, increasing the effective water depth of the biochemical pool can greatly increase the oxygen utilization rate, that is, greatly reduce the aeration air volume. Although the increase in water depth requires an increase in the boost pressure of the aeration fan, the overall energy consumption is greatly reduced.

[0005] Therefore, the use of biochemical towers instead of traditional biochemical pools is a major technological innovation in the field of sewage treatment.

[0006] Several biochemical tower invention patents or invention patents have been published in China, but they have problems such as complex structure, high equipment investment, difficult maintenance, low aerator efficiency, etc., or they are divided into anoxic zone, aerobic zone and sedimentation zone from bottom to top, and the water depth of the aerobic reaction pool is not increased, which only saves floor space and does not reduce aeration energy consumption. For example:

[0007] The "aeration biochemical tower" with patent number ZL 02268427.1 uses a grid plate to separate the tower body into an upper half and a lower half, and fills the middle with comet balls. It is a biofilm process, which has the problem of filler clogging, difficulty in maintenance and replacement.

[0008] Patent number ZL 201610428935.9, "A tower-type aerobic degradation reactor", includes an aerobic degradation zone at the top and an anoxic reaction zone at the bottom, and the aeration system is set 4-5 meters below the water surface of the reactor. The water depth of the aerobic zone of the reactor is the same as that of a traditional biochemical pool, the floor space saved is limited, and there is no energy-saving effect.

[0009] The "top-mounted jet aeration biochemical tower" with patent number ZL 200820146102.4 includes an inner cylinder, an outer cylinder, an ejector and a circulating water pipe. An air inlet is opened on the top of the ejector, and air is sucked in by the negative pressure generated inside the ejector. Because the bubble diameter generated by jet aeration is large, the oxygen utilization rate is the lowest among various aeration types, so the power consumption of the biochemical tower is large; in addition, the air density is small, and when the air-water mixture is sprayed from the top to the bottom, it is difficult for the bubbles to reach the bottom of the biochemical tower, causing the lower mixed liquid to be lack of oxygen.

[0010] Patent No. 201910738714.5, "An Energy-saving Tower Internal Circulation Reactor", includes an inner tower, an outer tower, an inlet water distribution pipe and a water production pipe. An MBR membrane reaction unit is arranged at the upper end of the inner tower. An aerobic biofilm reaction zone, an anoxic anaerobic biofilm reaction zone and a mud pool zone are arranged between the outer tower and the inner tower. The aerobic biofilm reaction zone is filled with aerobic biological fillers, and the anoxic anaerobic biofilm reaction zone is filled with anoxic anaerobic biological fillers. It is a combination of a biofilm process and a membrane bioreactor. The shortcomings include: the biological fillers are easy to clog and difficult to repair and replace; the ultrafiltration membrane needs to be cleaned and backwashed frequently, and the operation and management are complicated and costly; the aerator is located directly below the MBR membrane reaction unit, the water depth is low, and the oxygen utilization rate is not high. Summary of the invention

[0011] The purpose of the present invention is to provide a high-efficiency cyclone aerator, which has the advantages of large aeration volume, no clogging, maintenance-free, corrosion-resistant, etc. The biochemical tower using the high-efficiency cyclone aerator can solve the problems of large floor space and high power consumption of reinforced concrete biochemical pools, and the problems of complex structure, high equipment investment, and difficult maintenance of existing biochemical towers. It has the advantages of large height-to-diameter ratio, saving floor space; high oxygen utilization rate, saving energy consumption; simple structure, and maintenance-free.

[0012] In order to achieve the above object, the present invention adopts the following technical solutions:

[0013] A biochemical tower equipped with a high-efficiency cyclone aerator and a settling tank comprises an outer cylinder of the biochemical tower, wherein an arched cover plate is arranged on the top of the outer cylinder of the biochemical tower, and an observation hole, a breathing valve and an exhaust gas outlet are arranged on the arched cover plate; a sewage inlet, an air inlet, a sludge outlet, a water outlet and a manhole are arranged on the side walls of the outer cylinder of the biochemical tower respectively; an inner cylinder is arranged in the outer cylinder of the biochemical tower, and the inner cylinder is arranged on the central axis of the outer cylinder of the biochemical tower, and the inner cylinder comprises a cylinder and a cone bucket, the cylinder is connected to a cone, the cone is arranged in the lower section of the outer cylinder of the biochemical tower, and the cone is arranged in the bottom of the outer cylinder of the biochemical tower through a support; the bottom of the cone is connected to the sludge outlet through a sludge discharge pipe; a guide pipe is arranged in the inner cylinder, a guide channel is arranged on the top of the guide pipe, a water distributor is arranged on the bottom of the guide pipe, a water outlet weir is arranged on the inner cylinder, and the water outlet weir is connected to the water outlet through a pipeline.

[0014] Preferably, one output port of the sludge outlet is connected to a direct discharge, and the other output port of the sludge outlet is connected to a sewage pump through a pipeline.

[0015] Preferably, the outer wall of the inner tube is provided with a circle of reflux grooves and a plurality of reflux pipes, and the reflux pipes extend along the outer wall of the cylindrical body of the inner tube to the outer wall of the cone bucket.

[0016] Preferably, a sewage distribution pipe and an air distribution pipe are provided at the bottom of the outer tube of the biochemical tower, and a plurality of sewage branch pipes and air branch pipes are provided on the sewage distribution pipe and the air distribution pipe, each of the sewage branch pipe and the air branch pipe is connected to a group of high-efficiency cyclone aerators, and a sewage pump and an aeration fan are respectively provided outside the outer tube of the biochemical tower, and the sewage pump and the aeration fan are respectively connected to the sewage distribution pipe and the air distribution pipe through the sewage inlet and the air inlet.

[0017] Preferably, the sewage distribution pipe and the air distribution pipe are arranged at the bottom of the outer cylinder of the biochemical tower and are located around the inner cylinder.

[0018] Preferably, the sewage distribution pipe and the air distribution pipe are distributed in a concentric ring arrangement at the bottom of the biochemical tower outer cylinder.

[0019] Preferably, the high-efficiency cyclone aerator comprises a water inlet, an air-water mixing zone, a diffusion tube and an outlet which are connected in sequence; the water inlet is connected to the sewage branch pipe on the sewage distribution pipe, and the air inlet is connected to the air branch pipe on the air distribution pipe; the air-water mixing zone adopts a cylindrical structure, the inner wall of the air-water mixing zone is provided with irregular strips, and the air inlet is tangentially arranged on one side of the mixing zone.

[0020] Preferably, the diffuser tube has a variable cross-section, the upper portion of the diffuser tube adopts a circular structure, and the lower portion of the diffuser tube transitions to a flat and long shape and is connected to an outlet.

[0021] Preferably, the outer tube of the biochemical tower adopts a steel structure, and the height of the outer tube of the biochemical tower is 12 to 25 meters.

[0022] Preferably, the water distributor is a cylinder with small holes evenly distributed around the periphery.

[0023] The present invention also provides an application method of a biochemical tower equipped with a high-efficiency cyclone aerator and a settling tank, the steps of which are as follows:

[0024] S1: The sewage A to be treated and the sludge returned from the sludge discharge pipe are pressurized by an external sewage pump and enter the outer cylinder of the biochemical tower through the sewage inlet;

[0025] After being compressed by the external aeration fan, the air enters the outer cylinder of the biochemical tower through the air inlet;

[0026] S2: Sewage and return sludge enter the mixing zone through the water inlet connected to the sewage branch pipe on the sewage distribution pipe;

[0027] The air enters the mixing zone tangentially through the air inlet connected to the air branch pipe on the air distribution pipe, and the gas and liquid are fully mixed and collided, cutting the air into small bubbles;

[0028] S3: Then it enters the outer tube of the biochemical tower from the outlet. The mixed liquid and return sludge in the biochemical tower are rich in microorganisms. Under the action of oxygen, the organic pollutants in the sewage to be treated are degraded into carbon dioxide and water by microorganisms, and ammonia nitrogen is oxidized into nitrate nitrogen, thus achieving the purpose of sewage purification;

[0029] S4: The mixed liquid after biochemical degradation enters the inner cylinder through the diversion channel, and the sewage enters the diversion pipe from the diversion channel and enters the water distributor connected to the diversion pipe. The mixed liquid is evenly distributed around the inner cylinder through the cylindrical small holes evenly distributed on the water distributor, and mud and water are separated under the action of gravity: the sludge with high density sinks to the cone bucket and is discharged from the biochemical tower through the sludge outlet through the sludge discharge pipe. Part of it is discharged as residual sludge in the direction of arrow C, and part of it is returned to the biochemical tower by the sewage pump; the water with lower density is in the upper part and is discharged from the outer cylinder of the biochemical tower through the outlet connected to the water outlet weir in the direction of arrow B;

[0030] At the same time, a circle of reflux grooves and several reflux pipes are provided on the outer wall of the inner tube. The reflux pipes extend along the outer wall of the inner tube and the cone bucket to near the bottom of the biochemical tower. Under the lifting effect of the cyclone aerator, a micro vacuum is formed at the bottom of the outer tube of the biochemical tower. The mixed liquid that flows into the reflux groove by gravity flows downward through the reflux pipe to the bottom of the outer tube of the biochemical tower, thereby achieving the purpose of diluting the incoming water and reducing the toxicity of certain pollutants in the sewage to microorganisms.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] 1. The outer cylinder of the biochemical tower used in the present invention is a cylinder with an arched cover plate on the top, which has good sealing performance. Several observation holes are set on the top cover of the outer cylinder to facilitate observation of the mixing situation, aeration situation, mud-water separation effect, etc. in the tower. A breathing valve and an exhaust gas outlet are set on the top cover. The function of the breathing valve is to inhale or exhale a certain amount of air when sewage enters and exits and the temperature rises and falls, so as to prevent overpressure or negative pressure from being generated in the tower; and to prevent the exhaust gas in the tower from being emitted into the atmosphere, so as to ensure that all exhaust gas enters the exhaust gas treatment system for treatment; and at the same time, to prevent clean air from the outside from entering the exhaust gas treatment system.

[0033] 2. The biochemical tower used in the present invention is a steel structure, and the height of the outer cylinder is 12 to 25 meters. The water depth of a traditional biochemical pool is generally 4 to 6 meters, and the height of the biochemical tower is more than 2 to 4 times that of a traditional biochemical pool. Under the same volume, the biochemical tower of the present invention can save 50% to 75% of the floor space. In addition, the oxygen utilization rate increases with the increase of the water depth. When the water depth is 6 meters, the oxygen utilization rate of the high-efficiency cyclone aerator is about 30%; when the water depth is 12 meters, the oxygen utilization rate is about 50%; when the water depth is 25 meters, the oxygen utilization rate can reach more than 80%. Therefore, the biochemical tower of the present invention can also reduce the aeration amount by more than 50% and save more than 30% of energy consumption.

[0034] 3. The inner cylinder used in the present invention is a built-in vertical flow settling tank. Compared with radial flow and inclined plate sedimentation tanks, the vertical flow settling tank has a simple structure and no power equipment, inclined plates and other parts that need to be maintained; it requires a larger height, just in time to utilize the high liquid level of the biochemical tower; the built-in settling tank can also simplify the pipeline and save floor space.

[0035] 4. The outer wall of the inner cylinder used in the present invention is provided with a circle of reflux grooves and a number of reflux pipes. The reflux pipes extend along the outer wall of the inner cylinder and the cone bucket to near the bottom of the biochemical tower. Under the lifting effect of the cyclone aerator, a slight vacuum is formed at the bottom of the outer cylinder of the biochemical tower. The mixed liquid flowing into the reflux groove flows downward to the bottom of the biochemical tower through the reflux pipe. The internal circulation of the mixed liquid can be realized without additional power, so as to achieve the purpose of diluting the incoming water and reduce the toxicity of certain pollutants in sewage to microorganisms. In practical applications, the size and number of the reflux pipes are determined according to the reflux ratio.

[0036] 5. The high-efficiency cyclone aerator used in the present invention is composed of a water inlet, an air inlet, a gas-water mixing zone, a diffusion tube and an outlet; the gas-water mixing zone is cylindrical, and the inner wall has irregular strips. The air inlet enters the mixing zone tangentially, and the gas and liquid are fully mixed and collided, cutting the air into small bubbles; the diffusion tube is a variable cross-section, the upper part is round, and the lower outlet is oblate, so that the gas-liquid mixture forms a high-speed flow, which provides oxygen for the microorganisms in the biochemical tower while providing sufficient hybrid power for the mud-water mixture; because the flow channel is wide, it will not be blocked, and the aeration volume is large. When the aeration volume of an aerator can reach 50~100m3 / h, the pipeline is relatively simple and easy to install; the high-efficiency cyclone aerator is made of polypropylene material. The high-efficiency cyclone aerator of the present invention has the advantages of large aeration volume, no blockage, maintenance-free, corrosion resistance, etc., and has a service life of more than 20 years. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the structure of a biochemical tower provided with a high-efficiency cyclone aerator and a settling tank proposed by the present invention;

[0038] Figure 2 The present invention provides a schematic structural diagram of a high-efficiency cyclone aerator in a biochemical tower provided with a high-efficiency cyclone aerator and a settling tank.

[0039] Numbers in the figure:

[0040] 1. Biochemical tower outer tube; 2. Inner tube; 3. High-efficiency cyclone aerator; 4. Sewage distribution pipe; 5. Air distribution pipe; 6. Sewage branch pipe; 7. Air branch pipe; 11. Sewage inlet; 12. Air inlet; 13. Sludge outlet; 14. Observation hole; 15. Breathing valve; 16. Waste gas outlet; 17. Water outlet; 18. Manhole; 19. Aeration fan; 20. Sewage pump; 21. Support; 22. Diversion channel; 23. Diversion pipe 24. Water distributor; 25. Water outlet weir; 26. Reflux trough; 27. Reflux pipe; 30. Sludge discharge pipe; 31. Water inlet; 32. Air inlet; 33. Air-water mixing area; 34. Diffuser; 35. Outlet. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0042] like Figure 1 and Figure 2As shown, a biochemical tower provided by the present invention is provided with a high-efficiency cyclone aerator and a sedimentation tank, including a biochemical tower outer tube 1, an inner tube 2, a high-efficiency cyclone aerator 3, a sewage distribution pipe 4 and an air distribution pipe 5; the top of the biochemical tower outer tube 1 is provided with an arched cover plate, and the arched cover plate is provided with an observation hole 14, a breathing valve 15 and a waste gas outlet 16, and the observation hole 14 is convenient for observing the mixing conditions, aeration conditions, mud-water separation effects, etc. in the tower. The function of the breathing valve 15 is to inhale or exhale a certain amount of air when sewage is in and out, and the temperature rises and falls, so as to prevent overpressure or negative pressure from being generated in the tower; the waste gas outlet 16 can prevent the waste gas in the tower from being emitted into the atmosphere, ensuring that all waste gas is discharged according to Figure 1 The air in the direction of the upper arrow D enters the exhaust gas treatment system for treatment; at the same time, clean air from the outside is prevented from entering the exhaust gas treatment system.

[0043] The side walls of the biochemical tower outer tube 1 are respectively provided with a sewage inlet 11, an air inlet 12, a sludge outlet 13, a water outlet 17 and a manhole 18.

[0044] A built-in vertical flow sedimentation tank inner cylinder 2 is installed in the outer cylinder 1 of the biochemical tower, and the inner cylinder 2 is installed on the central axis of the outer cylinder 1 of the biochemical tower. The inner cylinder 2 includes a cylinder and a cone bucket, the cylinder is connected to the cone, the cone is arranged at the lower section of the outer cylinder 1 of the biochemical tower, and the cone is installed in the outer cylinder 1 of the biochemical tower through a support 21; the bottom of the cone is connected to the sludge outlet 13 through a sludge discharge pipe 30, and an output port of the sludge outlet 13 is connected to the direct discharge. The inner cylinder 2 adopts the structure of a vertical flow sedimentation tank. Compared with the radial flow and inclined plate sedimentation tanks, the vertical flow sedimentation tank has a simple structure and does not have power equipment, inclined plates and other parts that need to be maintained; it requires a larger height, just in time to utilize the high liquid level of the biochemical tower; the built-in sedimentation tank can also simplify the pipeline and save floor space.

[0045] The outer wall of the inner tube 2 is provided with a circle of reflux grooves 26 and a plurality of reflux pipes 27, and each reflux pipe 27 is distributed along the outer wall of the cylinder of the inner tube 2 to the outer wall of the cone bucket. On the whole, the cone bucket of the inner tube 2 is close to the bottom of the inner tube of the outer tube 1 of the biochemical tower. In practical applications, the size and number of the reflux pipes can be determined according to the reflux ratio. A guide pipe 23 is provided in the inner tube 2, a guide channel 22 is provided on the top of the guide pipe 23, and a water distributor 24 is provided at the bottom of the guide pipe 23. The water distributor 24 is a cylinder with small holes evenly distributed around it. A water outlet weir 25 is provided on the inner tube 2, and the water outlet weir 25 is connected to the water outlet 17 through a pipeline.

[0046] Furthermore, one output port of the sludge outlet 13 provided by the present invention is connected to direct discharge, and the other output port is connected to the sewage pump 20 through a pipeline to form a circulation pipeline.

[0047] A sewage distribution pipe 4 and an air distribution pipe 5 are provided at the bottom of the biochemical tower outer tube 1, and a plurality of sewage branch pipes 6 and air branch pipes 7 are provided on the sewage distribution pipe 4 and the air distribution pipe 5, respectively. Each sewage branch pipe 6 and the air branch pipe 7 are connected to a group of high-efficiency cyclone aerators 3. A sewage pump 20 and an aeration fan 19 are provided outside the biochemical tower outer tube 1, respectively. The sewage pump 20 and the aeration fan 19 are connected to the sewage distribution pipe 4 and the air distribution pipe 5 through the sewage inlet 11 and the air inlet 12, respectively. The sewage distribution pipe 4 and the air distribution pipe 5 are arranged at the bottom of the biochemical tower outer tube 1 and around the inner tube 2, and the sewage distribution pipe 4 and the air distribution pipe 5 are distributed and arranged in a concentric ring shape at the bottom of the biochemical tower outer tube 1.

[0048] Furthermore, the high-efficiency cyclone aerator 3 provided by the present invention is made of polypropylene material, and includes a water inlet 31, an air-water mixing zone 33, a diffusion pipe 34 and an outlet 35 connected in sequence. The water inlet 31 is connected to the sewage branch pipe 6 on the sewage distribution pipe 4, and the air inlet 32 ​​is connected to the air branch pipe 7 on the air distribution pipe 5; the air-water mixing zone 33 adopts a cylindrical structure, and the inner wall of the air-water mixing zone 33 is provided with irregular strips, and the air inlet 32 ​​is tangentially arranged on one side of the mixing zone 33. The diffusion pipe 34 adopts a variable cross-section, the upper part of the diffusion pipe 34 adopts a circular structure, and the lower part of the diffusion pipe 34 transitions to a flat and long shape and is connected to the flat outlet 35. The air distribution pipe 5 directs the air from the air inlet 32 ​​into the mixing zone 33, and the gas and liquid are fully mixed and collided, and the air is cut into small bubbles; the diffusion pipe 34 is a variable cross-section, the upper part is round, and the lower outlet is oblate, so that the gas-liquid mixture forms a high-speed flow, which provides oxygen for the microorganisms in the biochemical tower and provides sufficient hybrid power for the mud-water mixture; because the flow channel is wide, it will not be blocked, the aeration volume is large, and the aeration volume of each aerator can reach 50~100m3 / h, the pipeline is simple, and the installation is convenient; the high-efficiency cyclone aerator 3 is made of polypropylene material. The high-efficiency cyclone aerator 3 provided by the present invention has the advantages of large aeration volume, no blockage, maintenance-free, corrosion resistance, etc., and has a service life of more than 20 years.

[0049] Furthermore, the outer tube 1 of the biochemical tower disclosed in the present invention adopts a steel structure, and the height of the outer tube 1 of the biochemical tower is 12 to 25 meters. The water depth of a traditional biochemical pool is generally 4 to 6 meters, and the height of the biochemical tower is more than 2 to 4 times that of a traditional biochemical pool. Under the same volume, the biochemical tower of the present invention can save 50% to 75% of the floor space. In addition, the oxygen utilization rate increases with the increase of the water depth. When the water depth is 6 meters, the oxygen utilization rate of the high-efficiency cyclone aerator is about 30%; when the water depth is 12 meters, the oxygen utilization rate is about 50%; when the water depth is 25 meters, the oxygen utilization rate can reach more than 80%. Therefore, the biochemical tower of the present invention can also reduce the aeration volume by more than 50% and save more than 30% of energy consumption.

[0050] The working principle of the present invention is as follows:

[0051] S1: The sewage A to be treated and the sludge returned from the sludge discharge pipe 30 are pressurized by the external sewage pump 20 and enter the outer tube 1 of the biochemical tower through the sewage inlet 11;

[0052] After being compressed by the external aeration fan 19, the air enters the outer tube 1 of the biochemical tower through the air inlet 12;

[0053] S2: Sewage and return sludge enter the mixing zone 33 through the water inlet 31 connected to the sewage branch pipe 6 on the sewage distribution pipe 4;

[0054] The air enters the mixing zone 33 tangentially through the air inlet 32 ​​connected to the air branch pipe 7 on the air distribution pipe 5, and the gas and liquid are fully mixed and collided, cutting the air into small bubbles;

[0055] S3: Then the sewage enters the outer tube 1 of the biochemical tower from the outlet 35. The mixed liquid and the return sludge in the biochemical tower are rich in microorganisms. Under the action of oxygen, the organic pollutants in the sewage to be treated are degraded into carbon dioxide and water by the microorganisms, and the ammonia nitrogen is oxidized into nitrate nitrogen, thereby achieving the purpose of sewage purification;

[0056] S4: The mixed liquid after biochemical degradation enters the inner tube 2 through the diversion channel 22, and the sewage enters the diversion pipe 23 through the diversion channel 22, and enters the water distributor 24 connected to the diversion pipe 23. The mixed liquid is evenly distributed to the surroundings of the inner tube through the cylindrical small holes evenly distributed on the water distributor 24, and mud and water are separated under the action of gravity: the sludge with high density sinks to the cone bucket, and is discharged from the biochemical tower through the sludge outlet 13 through the sludge discharge pipe 30. Part of it is discharged as residual sludge in the direction of arrow C, and part of it is returned to the biochemical tower by the sewage pump; the water with lower density is in the upper part, and is discharged from the outer tube 1 of the biochemical tower through the outlet 17 connected to the water outlet weir 25 in the direction of arrow B;

[0057] At the same time, a circle of reflux grooves 26 and a number of reflux pipes 27 are provided on the outer wall of the inner tube. The reflux pipes 27 extend along the outer wall of the inner tube and the cone bucket to near the bottom of the biochemical tower. Under the lifting effect of the cyclone aerator, a slight vacuum is formed at the bottom of the outer tube 1 of the biochemical tower. The mixed liquid that flows into the reflux groove by gravity flows downward through the reflux pipes 27 to the bottom of the outer tube 1 of the biochemical tower, thereby achieving the purpose of diluting the incoming water and reducing the toxicity of certain pollutants in the sewage to microorganisms.

[0058] The present invention solves the problem of large floor space and high power consumption of reinforced concrete biochemical pool by building high-efficiency cyclone aerator and sedimentation tank into the outer cylinder of biochemical tower, and solves the problem of complex structure, high equipment investment and difficult maintenance of existing biochemical tower. The present invention adopts biochemical tower with a height of 12 to 25 meters, with high oxygen utilization rate and energy saving; it is a simple structure and maintenance-free integrated biological treatment equipment.

[0059] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0061] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A biochemical tower equipped with a high-efficiency cyclone aerator and a settling tank, comprising a biochemical tower outer cylinder (1), the top of the biochemical tower outer cylinder (1) is provided with an arched cover plate, the arched cover plate is provided with an observation hole (14), a breathing valve (15) and an exhaust gas outlet (16); characterized in that: The side walls of the biochemical tower outer cylinder (1) are respectively provided with a sewage inlet (11), an air inlet (12), a sludge outlet (13), a water outlet (17) and a manhole (18); an inner cylinder (2) is provided inside the biochemical tower outer cylinder (1); the inner cylinder (2) is arranged on the central axis of the biochemical tower outer cylinder (1); the inner cylinder (2) comprises a cylinder and a cone; the cylinder is connected to the cone; the cone is arranged at the lower section of the biochemical tower outer cylinder (1); the cone The support (21) is arranged in the bottom of the outer cylinder (1) of the biochemical tower; the bottom of the cone is connected to the sludge outlet (13) through a sludge discharge pipe (30); a guide pipe (23) is arranged in the inner cylinder (2); a guide channel (22) is arranged at the top of the guide pipe (23); a water distributor (24) is arranged at the bottom of the guide pipe (23); a water outlet weir (25) is arranged on the inner cylinder (2); and the water outlet weir (25) is connected to the water outlet (17) through a pipeline; A sewage distribution pipe (4) and an air distribution pipe (5) are provided at the bottom of the biochemical tower outer tube (1); a plurality of sewage branch pipes (6) and air branch pipes (7) are provided on the sewage distribution pipe (4) and the air distribution pipe (5); each sewage branch pipe (6) and air branch pipe (7) is connected to a group of high-efficiency cyclone aerators (3); a sewage pump (20) and an aeration fan (19) are provided outside the biochemical tower outer tube (1); the sewage pump (20) and the aeration fan (19) are connected to the sewage distribution pipe (4) and the air distribution pipe (5) through a sewage inlet (11) and an air inlet (12), respectively; The outer wall of the inner tube (2) is provided with a circle of reflux grooves (26) and a plurality of reflux pipes (27). The reflux pipes (27) extend along the outer wall of the cylinder and the cone of the inner tube (2) to near the bottom of the biochemical tower. Under the lifting action of the cyclone aerator, a slight vacuum is formed at the bottom of the outer tube (1) of the biochemical tower. The mixed liquid flowing into the reflux groove (26) flows downward through the reflux pipes (27) to the bottom of the outer tube (1) of the biochemical tower, thereby achieving the purpose of diluting the incoming water and reducing the toxicity of certain pollutants in the sewage to microorganisms. The height of the biochemical tower outer tube (1) is 12 to 25 meters.

2. A biochemical tower equipped with a high-efficiency cyclone aerator and a settling tank according to claim 1, characterized in that: One output port of the sludge outlet (13) is connected to a direct discharge, and the other output port of the sludge outlet (13) is connected to a sewage pump (29) via a pipeline.

3. A biochemical tower equipped with a high-efficiency cyclone aerator and a settling tank according to claim 1, characterized in that: The sewage distribution pipe (4) and the air distribution pipe (5) are arranged at the bottom of the outer cylinder (1) of the biochemical tower and are located around the inner cylinder (2).

4. A biochemical tower equipped with a high-efficiency cyclone aerator and a settling tank according to claim 3, characterized in that: The sewage distribution pipe (4) and the air distribution pipe (5) are distributed at the bottom of the biochemical tower outer cylinder (1) in a concentric ring arrangement.

5. A biochemical tower equipped with a high-efficiency cyclone aerator and a settling tank according to claim 1, characterized in that: The high-efficiency cyclone aerator (3) comprises a water inlet (31), an air-water mixing zone (33), a diffusion pipe (34) and an outlet (35) which are connected in sequence; the water inlet (31) is connected to a sewage branch pipe (6) on a sewage distribution pipe (4), and the air inlet (32) is connected to an air branch pipe (7) on an air distribution pipe (5); the air-water mixing zone (33) adopts a cylindrical structure, the inner wall of the air-water mixing zone (33) is provided with irregular strips, and the air inlet (32) is tangentially arranged on one side of the mixing zone (33); the diffusion pipe (34) is a variable cross-section, the upper part of the diffusion pipe (34) adopts a circular structure, and the lower part of the diffusion pipe (34) transitions to a flat and long shape and is connected to the outlet (35).

6. A biochemical tower equipped with a high-efficiency cyclone aerator and a settling tank according to claim 1, characterized in that: The water distributor (24) is a cylinder with small holes evenly distributed around its periphery.

7. An application method of a biochemical tower equipped with a high-efficiency cyclone aerator and a settling tank, characterized in that: The biochemical tower with a high-efficiency cyclone aerator and a settling tank as claimed in claim 5 is used, and the steps are as follows: S1: The sewage to be treated and the sludge returned from the sludge discharge pipe (30) are pressurized by an external sewage pump (20) and then enter the outer cylinder (1) of the biochemical tower through the sewage inlet (11); After being compressed by an external aeration fan (19), the air enters the outer cylinder (1) of the biochemical tower through the air inlet (12); S2: Sewage and return sludge enter the air-water mixing zone (33) through the water inlet (31) connected to the sewage branch pipe (6) on the sewage distribution pipe (4); The air enters the air-water mixing zone (33) tangentially through the air inlet (32) connected to the air branch pipe (7) on the air distribution pipe (5), and the air and liquid are fully mixed and collided, thereby cutting the air into small bubbles; S3: Then the wastewater enters the outer tube (1) of the biochemical tower from the outlet (35). The mixed liquid and the return sludge in the biochemical tower are rich in microorganisms. Under the action of oxygen, the organic pollutants in the wastewater to be treated are degraded into carbon dioxide and water by the microorganisms, and the ammonia nitrogen is oxidized into nitrate nitrogen, thereby achieving the purpose of wastewater purification. S4: The mixed liquid after biochemical degradation enters the inner cylinder (2) through the diversion channel (22), and the sewage enters the diversion pipe (23) through the diversion channel (22), and enters the water distributor (24) connected to the diversion pipe (23). The mixed liquid is evenly distributed around the inner cylinder through the cylindrical small holes evenly distributed on the water distributor (24), and mud and water are separated under the action of gravity: the sludge with high density sinks to the cone bucket, and is discharged from the biochemical tower through the sludge outlet (13) through the sludge discharge pipe (30), part of which is discharged as residual sludge, and part of which is returned to the biochemical tower by the sewage pump; the water with low density is in the upper part, and is discharged from the outer cylinder (1) of the biochemical tower through the outlet (17) connected to the water outlet weir (25); At the same time, a circle of reflux grooves (26) and a plurality of reflux pipes (27) are provided on the outer wall of the inner tube. The reflux pipes (27) extend along the outer wall of the inner tube and the cone bucket to near the bottom of the biochemical tower. Under the lifting action of the cyclone aerator, a slight vacuum is formed at the bottom of the outer tube (1) of the biochemical tower. The mixed liquid flowing into the reflux groove by gravity flows downward through the reflux pipes (27) to the bottom of the outer tube (1) of the biochemical tower, thereby achieving the purpose of diluting the incoming water and reducing the toxicity of certain pollutants in the sewage to microorganisms.

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